色谱用大孔硅胶改性的研究

对用作色谱固定相载体的大孔硅胶的改性进行了研究.实验表明,球形大孔硅胶经ACROS生产的γ-氨丙基-三乙氧基硅烷化试剂硅烷化改性后,适合作HPLC手性OJ柱固定相的载体.     

萃取色谱法分离——火焰原子吸收法测定岩矿中的微量银

本文提出了以甲基膦酸二甲庚脂（Ｐ３５０）为固定相，硅烷化硅胶为载体，０．５ｍｏｌ／ＨＣｌ－０．１ｍｏｌ／ＬＮａＳＣＮ溶液为流动相，采用０．１ｍｏｌ／ＬＨＣｌ－０．６ｍｏｌ／ＬＮａＳＣＮ作洗脱液的萃取色谱法分离微量银的方法，研究了分离测试条件和干扰等。并对岩石矿物中的微量银进行了分离测定，获得良好结果，回收率达（９７－１０３）％。     

萃取色谱法分离─火焰原子吸收法测定岩矿中的微量银

本文提出了以甲基磷酸二甲庚脂（Ｐ３５０）为固定相，硅烷化硅胶为载体，０．５ｍｏｌ／Ｌ．ＨＣＩ—０．１ｍｏｌ／ＬＮａＳＣＮ溶液为流动相，采用０．１ｍｏｌ／ＬＨＣＩ—０．６ｍｏｌ／ＬＮａＳＣＮ作洗脱液的萃取色谱法分离微量银的方法。研究了分离测试条件和干扰等。并对岩石矿物中的微量银进行了分离测定，获得良好结果。回收率达（９７—１０５）％。     

一种新型手性多相钯催化剂的研制及应用

通过在大孔硅烷化硅胶上涂敷手性高分子配位体－－三苯基氨基甲酸纤维素酯,合成了一类新型手性多相钯催化剂;探讨了其在酮的不对称氢化反应中的催化活性及手性诱导问题。     

硅胶-P350萃取色谱法连续分离微量铟(Ⅲ)、铊(Ⅲ)和金(Ⅲ)的研究

本文研究了以１．０ｍｏｌ／ＬＨＢｒ溶液为流动相，以硅烷化硅胶负载的甲基膦酸二甲庚脂（Ｐ３５０）作固定相，萃取色谱法使微量铟、铊和金与大量共存杂质元素分离，富集在色谱柱上的铟、铊和金分别用水、１．５ｍｏｌ／ＬＮａＡｃ和１％Ｎａ２ＳＯ３溶液洗脱进行连续分离与测定。经实际样品的试用考核，结果令人满意。     

β—环糊精色谱手性固定相的合成及性能表征

将β－环糊精（β－ＣＤ）键合到硅胶表面上制成薄层色谱手性键合固定相．用红外光谱、元素分析和热重分析测定键合相的化学组成和性质．对键合反应的工艺条件和键合相的色谱性能进行了较详细的研究．６对联萘酚类对映体在键合固定相薄层板和石油醚－乙酸乙酯－甲醇、石油醚－乙酸乙酯－乙腈溶剂系统中得到完全的分离．对映体的Ｒｆ值为１．１９～１．６８．     

Chiralcel-OJ柱V-D曲线测定与拆分应用

通过测定日本Ｄａｉｃｅｌ公司出售的Ｃｈｉｒａｌｃｅｌ－ＯＪ柱的Ｖａｎ－Ｄｅｅｍｔｅｒ曲线可知Ｃｈｉｒａｌｃｅｌ－ＯＪ柱的Ｖａｎ－Ｄｅｅｍｔｅｒ曲线与一般的手性柱的Ｖａｎ－Ｄｅｅｍｔｅｒ曲线不同，曲线不仅出现了最低点而且出现了最高点．用该Ｃｈｉｒａｌｃｅｌ－ＯＪ柱拆分三对对映体并讨论了流速与流动相配比对分离度的影响．实验结果表明，随着流速的增加，分离度减小；随着流动相改性剂量的增加，分离度增加     

一种制备正三十二烷的新方法

正三十二烷可以从植物中分离［１］,曾被用作气相色谱的固定相［２］,也是豆类昆虫的引诱剂,在化学一上该物质还有其它应用．正三十二烷可通过溴代十六烷与二羧酸酰氯的Ｂｌａｉｓｅ－Ｋｅｔｏｎｅ反应制备［３］．Ｃ１６Ｈ３３Ｂｒ＋ＣｌＣＯ（ＣＨ２）ｎＣＯＣｌＢ－...     

多取代苯甲酸胆甾醇酯液晶的合成及表征

合成了一系列多取代苯甲酸胆甾醇酯［４－ＣｎＨ２ｎ＋１Ｏ－３,５－（Ｂｒ）２－Ｃ６Ｈ２－ＣＯＯＣｈ］,（ｎ＝２,４,６,８,１０）,并通过ＤＳＣ和偏光显微镜对其介晶性进行了研究．结果显示该类化合物均呈现出胆甾相,与其未溴代的同系物相比,介晶相温度范围变窄．当ｎ＝４时,化合物在１１１～１６３℃呈胆甾相．     

BaO单独改性Ni／α—Al2O3催化剂的研究

用浸渍法改性α－Ａｌ２Ｏ３载体，并制成Ｎｉ／α－Ａｌ２Ｏ３催化剂。用动态热重法考察这些催化剂样品的还原性能和抗积炭性能，并用Ｘ－射线宽化法测定还原后的平均Ｎｉ晶粒度。结果表明，在由相似的氧化物改性的一系列样品中，ＢａＯ改性表现出除Ｌａ２Ｏ３之外最好的还原性能和最好的Ｎｉ分散度；提高催化剂抗积炭性能的最佳加量约为４．７％，ＢａＯ改性有利于提高Ｎｉ／α－Ａｌ２Ｏ３的水热稳定性，使催化剂的比表面、镍分散     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that